Calculating speeds, rates and times
Guys,
how to calculate a descendrate that i have to fly to reach a fix in XX minutes from a flightlevel at an altitude? For example, from 410 be at level in 300 in 7 min?How to get the gnd speed with easy formulas? What else formulars can be useful for flying a 737? Thanks so much! OD |
Wish I had an FMS.
|
1. R.O.D. = 5 x GS
2. Top of Descent at = ETA minus 30 min;) 3. Amount of Extra Fuel = 1 line of Forecast equals 1.000 kg, 2 lines of Forecast e. 2.000 kg;) |
Another reasonably good "rule of thumb" is:
Mach Number = Nautical Miles per minute. e.g., M=0.75 or about 7.5 Nautical miles per minute |
Alt to loose x 3
then add 10 for slowing down 11000' (11) x 3 = 33 add 10 at 1500 fpm your TOD is 43 NM from way piont. |
410 be at level in 300 in 7 min |
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